Function updatePortalComponent

docs/external/js/react-dom.development.js:18339–18355

(current, workInProgress, renderExpirationTime)

  }

  function updatePortalComponent(current, workInProgress, renderExpirationTime) {
    pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
    var nextChildren = workInProgress.pendingProps;

    if (current === null) {
      // Portals are special because we don't append the children during mount
      // but at commit. Therefore we need to track insertions which the normal
      // flow doesn't do during mount. This doesn't happen at the root because
      // the root always starts with a "current" with a null child.
      // TODO: Consider unifying this with how the root works.
      workInProgress.child = reconcileChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
    } else {
      reconcileChildren(current, workInProgress, nextChildren, renderExpirationTime);
    }

    return workInProgress.child;
  }

  function updateContextProvider(current, workInProgress, renderExpirationTime) {
    var providerType = workInProgress.type;